<!DOCTYPE html>
<html lang="zh-CN">

<head>

    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">

    <title>20 - 按钮水波纹 (HTML+CSS+JS)</title>

    <link rel="stylesheet" href="./css/index.css">
    <!-- <script  src="./js/index.js"></script> -->

</head>

<body>

    <button type="button">按钮</button>
    <button type="button">水波纹</button>


    <script src="./js/index.js"></script>
</body>


</html>